<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <el-alert
        title="注意:只允许修改第三级分类的参数"
        show-icon
        type="warning"
        :closable="false"
      >
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
          size="mini"
    v-model="selectedCateKeys"
    :options="catelist"
    :props="cateProps"
    @change="handleChange"></el-cascader>
        </el-col>
      </el-row>

      <!-- tab页面标签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数面板 -->
    <el-tab-pane label="动态参数" name="many">
      <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
      <!-- 动态参数的表格 -->
      <el-table :data="manyTableData" border stripe>
        <el-table-column type="expand">
          <!-- 循环渲染tag标签 -->
          <template v-slot="scope">
            <el-tag @close="handleClose(i, scope.row)" :closable="true" :key="i" v-for="(item,i) in scope.row.attr_vals">{{item}}</el-tag>
            <el-input
  class="input-new-tag"
  v-if="scope.row.inputVisible"
  v-model="scope.row.inputValue"
  ref="saveTagInput"
  size="small"
  @keyup.enter.native="handleInputConfirm(scope.row)"
  @blur="handleInputConfirm(scope.row)"
>
</el-input>
<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
        <el-table-column label="操作">
          <template v-slot="scope">
            <el-button v-model="scope.row" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
            <el-button v-model="scope.row" type="danger" icon="el-icon-delete" @click="deleteParams(scope.row.attr_id)">删除</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-tab-pane>
    <!-- 添加静态属性面板 -->
    <el-tab-pane label="静态属性" name="only">
      <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
      <el-table :data="onlyTableData" border stripe>
        <el-table-column type="expand">
          <!-- 循环渲染tag标签 -->
          <template v-slot="scope">
            <el-tag @close="handleClose(i, scope.row)" :closable="true" :key="i" v-for="(item,i) in scope.row.attr_vals">{{item}}</el-tag>
            <el-input
  class="input-new-tag"
  v-if="scope.row.inputVisible"
  v-model="scope.row.inputValue"
  ref="saveTagInput"
  size="small"
  @keyup.enter.native="handleInputConfirm(scope.row)"
  @blur="handleInputConfirm(scope.row)"
>
</el-input>
<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
        <el-table-column label="操作">
          <template v-slot="scope">
            <el-button v-model="scope.row" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
            <el-button v-model="scope.row" type="danger" icon="el-icon-delete" @click="deleteParams(scope.row.attr_id)">删除</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-tab-pane>
  </el-tabs>
    </el-card>

    <!-- 添加参数对话框 -->
    <el-dialog
  :title="'添加' + titleText"
  :visible.sync="addDialogVisible"
  width="50%"
  @close="addDialogClose"
  >
  <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="addForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
</el-dialog>

<!-- 修改参数对话框 -->
<el-dialog
  :title="'修改' + titleText"
  :visible.sync="editDialogVisible"
  width="50%"
  @close="editDialogClose"
  >
  <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="editForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
</el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类列表
      catelist: [],
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id', // 选中的值
        label: 'cat_name', // 看到的值
        children: 'children'
      },
      // 级联选择框双向绑定的数组
      selectedCateKeys: [],
      // 被激活的页签的名称
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态参数数据
      onlyTableData: [],
      // 控制添加动态静态属性对话框开关
      addDialogVisible: false,
      // 添加参数表单对象
      addForm: {
        attr_name: ''
      },
      addFormRules: {
        attr_name: [{
          required: true, message: '请输入参数名称', trigger: 'blur'
        }]
      },
      // 控制修改对话框开关
      editDialogVisible: false,
      // 修改参数对象
      editForm: {},
      // 修改参数对象规则
      editFormRules: {
        attr_name: [{
          required: true, message: '请输入参数名称', trigger: 'blur'
        }]
      }
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) { return this.$message.error('获取分类失败') }
      this.catelist = res.data
      console.log(this.catelist)
    },
    // 级联选择项发生变化时触发函数
    handleChange () {
      this.getParamsData()
    },
    // 获取参数的额列表数据
    async getParamsData () {
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      console.log(this.selectedCateKeys)
      // 根据所选分类的id 和当前所处面板获取参数
      const { data: res } = await this.$http(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示和隐藏
        item.inputVisible = false
        // 文本框输入的内容
        item.inputValue = ''
      })
      console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // tab页签点击处理函数
    handleTabClick () {
      console.log(this.activeName)
      this.getParamsData()
    },
    addDialogClose () {
      this.$refs.addFormRef.resetFields()
    },
    addParams () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) { return }
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) { return this.$message.error('添加参数失败') }
        this.$message.success('添加参数成功')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击修改按钮弹出对话框
    async showEditDialog (attrid) {
      console.log(attrid)
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrid}`, {
        params: { attr_sel: this.activeName }
      })
      if (res.meta.status !== 200) { return this.$message.error('获取参数信息失败') }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    editDialogClose () {
      this.$refs.editFormRef.resetFields()
    },
    // 点击确定修改参数
    editParams () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) { return }
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) { return this.$message.error('修改参数失败') }
        this.$message.success('修改成功')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    deleteParams (attrid) {
      this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(async() => {
        const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrid}`)
        if (res.meta.status !== 200) {
          console.log(this.meta.status)
          return this.$message('删除参数失败')
        }
        this.$message.success('删除参数成功')
        this.getParamsData()
        this.$message({
          type: 'success',
          message: '删除成功!'
        })
      }).catch(() => {
        this.$message({
          type: 'info',
          message: '已取消删除'
        })
      })
    },
    async handleInputConfirm (row) {
      // 文本框失去焦点或者按下enter都会触发
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有return 则输入的内容需要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 发起请求
      this.saveAttrVals(row)
    },
    // 将对attr_vals的操作，保存到数据库
    async saveAttrVals (row) {
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')// 将数组拼接成字符串发送请求
        })
      if (res.meta.status !== 200) {
        console.log(res.meta.status)
        return this.$message.error('新增参数项失败')
      }
      this.$message.success('新增参数项成功')
    },
    showInput (row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick方法作用：当页面上元素被重新渲染后才会执行回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应参数及选项
    handleClose (i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    // 如果按钮需要禁用。返回true
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) { return true }
      return false
    },
    cateId() {
      if (this.selectedCateKeys.length === 3) { return this.selectedCateKeys[2] }
      return null
    },
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>
<style lang="less" scoped>
.cat_opt {
  margin: 15px 0px;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 150px
}
</style>
<style lang="less">
.el-cascader-menu {
  height: 360px;
}
</style>
